/* ============================================
   Header / Navigation
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  display: flex;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.0);
  backdrop-filter: blur(0px);
  transition: background-color var(--duration-normal) var(--ease-out),
              backdrop-filter var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.header.scrolled {
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border-color);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* Logo - Typographic Wordmark */
.header__logo {
  display: flex;
  align-items: center;
  z-index: var(--z-header);
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.header__logo:hover {
  opacity: 0.7;
}

.header__logo-mark {
  font-family: var(--font-primary);
  font-size: 1.4rem;
  font-weight: var(--weight-extrabold);
  letter-spacing: -0.03em;
  color: var(--color-black);
  line-height: 1;
  white-space: nowrap;
}

.header__logo-mk {
  font-weight: var(--weight-regular);
  font-size: 0.85em;
  color: var(--color-gray-500);
}

/* Nav */
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.header__nav-link {
  position: relative;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-gray-600);
  transition: color var(--duration-fast) var(--ease-out);
  border-radius: var(--radius-md);
}

.header__nav-link:hover {
  color: var(--color-black);
}

/* Dropdown */
.header__dropdown {
  position: relative;
}

.header__dropdown-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-gray-600);
  transition: color var(--duration-fast) var(--ease-out);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.header__dropdown-trigger:hover {
  color: var(--color-black);
}

.header__dropdown-icon {
  width: 12px;
  height: 12px;
  transition: transform var(--duration-normal) var(--ease-out);
}

.header__dropdown:hover .header__dropdown-icon {
  transform: rotate(180deg);
}

.header__dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-1));
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 200px;
  background-color: var(--color-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out),
              visibility var(--duration-normal);
}

/* Bridge element to prevent hover dead-zone between trigger and menu */
.header__dropdown-menu::before {
  content: '';
  position: absolute;
  top: calc(-1 * var(--space-3));
  left: 0;
  right: 0;
  height: var(--space-3);
}

.header__dropdown:hover .header__dropdown-menu,
.header__dropdown.dropdown-open .header__dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.header__dropdown-item {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  border-radius: var(--radius-md);
  transition: background-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.header__dropdown-item:hover {
  background-color: var(--color-gray-100);
  color: var(--color-black);
}

/* Right section */
.header__right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Language Switch */
.lang-switch {
  display: flex;
  align-items: center;
  background: var(--color-gray-100);
  border-radius: var(--radius-full);
  padding: 2px;
  gap: 0;
}

.lang-switch__btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-gray-500);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-out);
  text-transform: uppercase;
}

.lang-switch__btn.active {
  background: var(--color-white);
  color: var(--color-black);
  box-shadow: var(--shadow-sm);
}

.lang-switch__btn:not(.active):hover {
  color: var(--color-black);
}

/* Contact Button */
.header__contact-btn {
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  background-color: var(--color-black);
  color: var(--color-white);
  border-radius: var(--radius-full);
  transition: all var(--duration-normal) var(--ease-out);
}

.header__contact-btn:hover {
  background-color: var(--color-gray-800);
  transform: translateY(-1px);
}

/* Mobile Menu Toggle */
.header__menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  height: 20px;
  cursor: pointer;
  z-index: var(--z-header);
}

.header__menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-black);
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast);
  transform-origin: center;
}

.header__menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.header__menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Navigation */
.header__mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  z-index: calc(var(--z-header) - 1);
  padding: calc(var(--header-height) + var(--space-8)) var(--container-padding) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-20px);
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility var(--duration-normal),
              transform var(--duration-normal) var(--ease-out);
  overflow-y: auto;
}

.header__mobile-nav.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.header__mobile-nav-link {
  display: block;
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--color-black);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border-color);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .header__nav {
    display: none;
  }

  .header__menu-toggle {
    display: flex;
  }

  .header__contact-btn {
    display: none;
  }
}

@media (max-width: 640px) {
  .header__logo-mark {
    font-size: 1.15rem;
  }
}